I have 98 dodge avenger had the water pump seize on timing belt and busted 8 vavles on the head in dec. the head has been rebuilt new water pump new timing belt new thermostat and housing as well as radiator hoses. My car is overheating and boilling in the overflow. What else could be wrong?

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could very well be a head gasket ,just because you have no oil in water or whatever doesnt mean to say the gasket hasnt failed between a piston and a water jacket which is the most common type of failure so stop reading these sites looking for a quick fix ,this vehicle is a 1998 ,its old and the gaskets at this age are likely to fail with age .Off with the head and renew the valve seals ,reseat the valves new gaskets renew any suspect water pipes and change the timing belts and water pump if driven by the timing belt at the same time .then it will run for another 15 yrs with no problems

Well the timing belt and water pump either work or they don't. So I doubt either part has actually failed.
I think I would want to figure out the running hot problem first since that could cause the other two if its a leaking head gasket.

This does sound like your water pump is leaking, or your head gasket has busted on the outside edge. I would check the water pump first, as it is fairly common for the seal to bust and leak coolant from the water pump.

The pump is driven by the timing belt so you basically need to take the front of the motor apart. It is quite a job to get at it but is doable. If you are going to do the job I'd suggest changing the timing belt, tensioner pulleys and the cam and crankshaft seals as well, may as well do some preventative maintenance while it is apart. I've got the whole proceedure and will make u a copy if you want.

depending if its a 2.0 or a 2.5 really either or, i personally recommend taking it to a shop, you have to pull the motor to get to the timing belt on a 2.0 and just the same on a 2.5, that or tilt it on such an agle to access the timing belt and to be able to remove the proper bolts to access the belt, then after you get to the belt you have to have a special tool for the belt tentioner and align the top dead center with the new belt, in doing this you may have to have a camsaft turn in a way that when the tentioner is let off they all align with the new belt... it is a very agrivating process...